WASHINGTON - A group of Democratic lawmakers on Wednesday wrote to Jared Kushner, US President Donald Trump's son-in-law and adviser, asking whether in his talks with foreign officials he had ever discussed financing for a deeply indebted Kushner Companies property in Manhattan.

The property at 666 Fifth Avenue has a $1.15 billion mortgage due in less than two years, and has raised concerns among lawmakers that it could pose a conflict of interest for Kushner.

Kushner headed Kushner Companies until he sold his interest to a family trust earlier this year. He is a senior adviser to the president and has been involved in Middle East policymaking.

The 13 Democratic lawmakers, in their two-page letter to Kushner and seen by Reuters, said: "We are concerned that you may be leveraging your White House position to seek financial assistance for 666 Fifth Avenue, which according to various reports has at least $1.2 billion in debt, of which more than half is owned" by Kushner Companies.

A White House spokesman declined comment on the letter and referred the matter to Kushner's lawyer, Abbe Lowell. Lowell could not immediately be reached for comment.